65520 is nontrivially palindromic in base 11.
It is a tau number, because it is divible by the number of its divisors (120).
It is an Ulam number.
It is a nialpdrome in base 2, base 4, base 10 and base 16.
It is a zygodrome in base 2 and base 4.
It is a congruent number.
265520 is an apocalyptic number.
65520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 65520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (135408).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
65520 is a wasteful number, since it uses less digits than its factorization.
65520 is an evil number, because the sum of its binary digits is even.
The square root of 65520 is about 255.9687480924. The cubic root of 65520 is about 40.3141922852.
The spelling of 65520 in words is "sixty-five thousand, five hundred twenty".